isrstealer | 92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f

General

Target

92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe
Size

1012KB
MD5

98d0000c28ed30d94374762113976b75
SHA1

60ceb509382e6309855d32cfcc99b34d782bd083
SHA256

92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f
SHA512

c1f3586a7b79c74de0b3ea7eb6d13c925d98655491ce043a9db56feef80c9b40e29f86b9e8d3e94328fc6c51722dc91e4e93b37beb15be97a4bbe8842f7ff1fa
SSDEEP

24576:2vzgO5yKsUaSuErRWNoEb0RkxFdtBNN57:zO5jGErsNrcc75

Score

10^/10

isrstealer collection stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/1116-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1116-146-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1116-148-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1116-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/220-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/220-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/220-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/220-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3908-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3908-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3908-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3908-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/220-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/220-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/220-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/220-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 860 set thread context of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 1116 set thread context of 3908	1116	vbc.exe	83
PID 1116 set thread context of 220	1116	vbc.exe	84

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1116	vbc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 860 wrote to memory of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 860 wrote to memory of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 860 wrote to memory of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 860 wrote to memory of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 860 wrote to memory of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 860 wrote to memory of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 860 wrote to memory of 1116	860	92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe	82
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 3908	1116	vbc.exe	83
PID 1116 wrote to memory of 220	1116	vbc.exe	84
PID 1116 wrote to memory of 220	1116	vbc.exe	84
PID 1116 wrote to memory of 220	1116	vbc.exe	84
PID 1116 wrote to memory of 220	1116	vbc.exe	84
PID 1116 wrote to memory of 220	1116	vbc.exe	84
PID 1116 wrote to memory of 220	1116	vbc.exe	84
PID 1116 wrote to memory of 220	1116	vbc.exe	84
PID 1116 wrote to memory of 220	1116	vbc.exe	84

C:\Users\Admin\AppData\Local\Temp\92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe
"C:\Users\Admin\AppData\Local\Temp\92810bfa22f1d71451860ab5ca81931a9e77218e89020e207438e19aa387840f.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:860
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1116
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\zYV7XPb60y.ini"
    3⤵
    PID:3908
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\2tcS5H7Hxn.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:220

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\zYV7XPb60y.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/220-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/220-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/220-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/220-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/860-133-0x0000000075590000-0x0000000075B41000-memory.dmp

Filesize
5.7MB

Download
memory/860-139-0x0000000075590000-0x0000000075B41000-memory.dmp

Filesize
5.7MB

Download
memory/860-132-0x0000000075590000-0x0000000075B41000-memory.dmp

Filesize
5.7MB

Download
memory/1116-148-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1116-146-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1116-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1116-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3908-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3908-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3908-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3908-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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